<?php

namespace App\Http\Controllers;

use App\Models\Article;
use App\Models\Category;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Auth;
use Illuminate\Support\Str;
use Illuminate\View\View;

class ArticleController extends Controller
{
    public function index(Request $request): View
    {
        $categoryId = $request->query('category');
        $q = trim((string) $request->query('q', ''));

        $categories = Category::ofType('article')->orderBy('sort')->orderBy('name')->get();

        $articles = Article::published()
            ->when($categoryId, fn ($query) => $query->where('category_id', $categoryId))
            ->when($q, function ($query) use ($q) {
                $query->where(function ($sub) use ($q) {
                    $sub->where('title', 'like', "%{$q}%")
                        ->orWhere('summary', 'like', "%{$q}%");
                });
            })
            ->paginate(10)
            ->withQueryString();

        return view('articles.index', compact('articles', 'categories', 'q', 'categoryId'));
    }

    public function show(Article $article): View
    {
        $user = request()->user();

        // 公开：已审且已发布；作者本人或审核员：可看自己投稿（含待审/驳回）
        $canView = $article->status === 'approved' && $article->published_at !== null;
        if (! $canView && $user) {
            $canView = $article->user_id === $user->id || $user->canPerm('articles.moderate');
        }
        if (! $canView) {
            abort(404);
        }

        return view('articles.show', compact('article'));
    }

    /**
     * 用户投稿表单（需登录）。
     */
    public function create(): View
    {
        $categories = Category::ofType('article')->orderBy('sort')->orderBy('name')->get();

        return view('articles.submit', compact('categories'));
    }

    /**
     * 提交用户投稿：写入 articles(user_id + status=pending)，审核前仅作者可见。
     */
    public function storeSubmission(Request $request)
    {
        $data = $request->validate([
            'category_id' => ['nullable', 'exists:categories,id'],
            'title' => ['required', 'string', 'max:160'],
            'summary' => ['nullable', 'string', 'max:255'],
            'body' => ['required', 'string'],
            'template' => ['required', 'in:standard,tech,feature'],
            'cover' => ['nullable', 'string', 'max:255'],
        ]);

        $data['body'] = \Purifier::clean($data['body'], 'article');

        $base = Str::slug(Str::ascii($data['title'])) ?: ('article-' . date('YmdHis'));
        $slug = $base;
        $i = 1;
        // withTrashed：软删除行仍占用 slug 唯一索引，须一并检查避免 Duplicate entry
        while (Article::withTrashed()->where('slug', $slug)->exists()) {
            $slug = $base . '-' . $i++;
        }

        Article::create([
            'category_id' => $data['category_id'] ?? null,
            'user_id' => Auth::id(),
            'title' => $data['title'],
            'slug' => $slug,
            'summary' => $data['summary'] ?? null,
            'body' => $data['body'],
            'template' => $data['template'],
            'cover' => $data['cover'] ?? null,
            'author' => Auth::user()->name,
            'status' => 'pending',
            'published_at' => null,
        ]);

        return redirect()->route('articles.mine')
            ->with('success', '投稿已提交，管理员审核通过后将公开展示');
    }

    /**
     * 我的投稿：当前用户自己的全部文章（含待审/驳回）。
     */
    public function mine(): View
    {
        $articles = Article::where('user_id', Auth::id())
            ->orderByDesc('created_at')
            ->paginate(10);

        return view('articles.mine', compact('articles'));
    }
}